Here are some links to websites relating to old and classic ballparks. Most, sadly no longer with us (the ballparks that is). Some of the sites are commercial but they offer views of old ballparks. There are a few good baseball history links as well. Take a tour and enjoy yourself.

This is a new site devoted to Ebbets Field.
http://www.ebbets-field.com/

Here's an excellent Crosley Field site. It's a bit slow loading but it's worth it.
http://www.crosleyfield.com

Facts about Pittsburgh's ballparks:
http://www.primenet.com/~gearhard/stadiums.html#recreation

A Forbes Field site:
http://www.clpgh.org/exhibit/neighborhoods/oakland/oak_n713.html

A.L. Ballparks:
http://www.geocities.com/Colosseum/Arena/5866/ballparks2.html

Misc. Ballpark sites:
http://www.baseballparks.com/
http://www.mwlguide.com/parks/pix/index.htm
http://www.ballparks.com/
http://www.bestweb.net/~merzbach/
http://users.aol.com/charliezeb/stadiums.htm

Baseball history links including defunct team sites:
http://www.brooklyn-dodgers.com/
http://athleticssociety.freeservers.com/inframes.htm
http://www3.primary.net/~tdalton/stlbrown.htm
http://home.utm.net/pattonhq/browns/main.html
http://www.baseballhalloffame.org/
http://www.baseball-links.com/links/History/
http://www.efxweb.com/timmyb/links/

They're even considering tearing down Fenway Park! A "Save Fenway" group has site worth visiting:
http://www.savefenwaypark.com/

And here's a site called "Field of Schemes". The name says it all:
http://www.fieldofschemes.com/